TM 11-6625-1831-13
5-3B.
Troubleshooting Test Panel (Cont)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2.
Check transformer T1 outputs. Check for 26 +8 Vac between T1 terminals 4 to 5, 5 to 6, and 4
to 6 (used for +28 Vdc and +20 Vdc supplies). Check for 7.4 + 1.5 Vac between T1 terminals 7 to
8, 8 to 9, 7 to 9 (used for +5 Vdc supply). Check for 8.1 +0.8 Vac between T1 terminals 10 to 11.
11 to 12, 10 to 12 (used for -5 Vdc supply).
A. If all readings are correct, check for open circuit between T1 and XA3 connector
See schematic for pin numbers.
Repair as necessary (para 5-14).
B. If any reading is not correct, go to step 3.
Step 3.
Check inputs to T1. Check for 200 Vac between T1 terminals 1 to 2, 1 to 3, and 2 to 3.
A.
If all readings are correct, replace T1 (para 5-6).
B.
If any reading is not correct, check for break in wiring between filters FL1, FL2,
FL3 and T1. Repair as necessary (para 5-14).
8. BITE CYCLING indicator fails to turn on.
Step 1.
Check indicator by replacing it.
Replace if defective (para 5-6).
Step 2.
Check Oscillator and Switch Module 1A2 by replacing it.
Replace if defective (para 5-6).
Step 3.
Check for open circuit in wiring. Test continuity from XA2-16 to BITE CYCLING indicator.
Test continuity from XA2-17 to pin C of SIGNAL J2 jack.
Repair wiring as necessary (para 5-14).
9. BITE CYCLING indicator fails to turn off.
Check Oscillator and Switch Module 1A2 by replacing it.
Replace if defective (para 5-6).
10. RANGE/DELAY ERROR indicator fails to turn on.
Step 1.
Check indicator by replacing it.
Replace if defective (para 5-6).
Step 2.
Check Oscillator and Switch Module 1A2 by replacing it.
Replace if defective (para 5-6).
Step 3.
Check wiring. Test continuity from XA2-R to RANGE/DELAY ERROR indicator. Test
continuity from XA2-5 to pin r of SIGNAL J2 jack.
Repair wiring as necessary (para 5-14).
11. RANGE/DELAY ERROR indicator fails to turn off.
Check Oscillator and Switch Module 1A2 by replacing it.
Replace if defective (para 5-6).
5-30
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